linux/arch/powerpc
Christophe Leroy cbe654c779 powerpc: warn on emulation of dcbz instruction in kernel mode
dcbz instruction shouldn't be used on non-cached memory. Using
it on non-cached memory can result in alignment exception and
implies a heavy handling.

Instead of silentely emulating the instruction and resulting in high
performance degradation, warn whenever an alignment exception is
taken in kernel mode due to dcbz, so that the user is made aware that
dcbz instruction has been used unexpectedly by the kernel.

Reported-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2e3acfe63d289c6fba366e16973c9ab8369e8b75.1631803922.git.christophe.leroy@csgroup.eu
2021-10-22 15:22:05 +11:00
..
boot powerpc/5200: dts: fix memory node unit name 2021-10-22 15:22:04 +11:00
configs powerpc/configs/microwatt: Enable options for systemd 2021-08-27 00:56:53 +10:00
crypto
include powerpc/32: Add support for out-of-line static calls 2021-10-22 15:22:05 +11:00
kernel powerpc: warn on emulation of dcbz instruction in kernel mode 2021-10-22 15:22:05 +11:00
kexec powerpc/machdep: Remove stale functions from ppc_md structure 2021-10-22 15:22:05 +11:00
kvm powerpc/asm: Remove UPD_CONSTR after GCC 4.9 removal 2021-10-09 00:15:59 +11:00
lib powerpc: Only build restart_table.c for 64s 2021-07-01 22:50:54 +10:00
math-emu powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
mm powerpc/fsl_booke: Update of TLBCAMs after init 2021-10-22 15:22:03 +11:00
net bpf: Introduce BPF nospec instruction for mitigating Spectre v4 2021-07-29 00:20:56 +02:00
perf powerpc/perf: Fix cycles/instructions as PM_CYC/PM_INST_CMPL in power10 2021-10-14 21:46:45 +11:00
platforms powerpc/vas: Fix potential NULL pointer dereference 2021-10-22 15:22:04 +11:00
purgatory powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S 2021-04-08 21:17:43 +10:00
sysdev powerpc/xics: Set the IRQ chip data for the ICS native backend 2021-09-15 22:05:53 +10:00
tools powerpc/head_check: Fix shellcheck errors 2021-08-17 22:52:02 +10:00
xmon powerpc: Refactor verification of MSR_RI 2021-08-26 21:21:07 +10:00
Kbuild
Kconfig powerpc/32: Add support for out-of-line static calls 2021-10-22 15:22:05 +11:00
Kconfig.debug powerpc/ptdump: Convert powerpc to GENERIC_PTDUMP 2021-08-25 13:35:48 +10:00
Makefile powerpc: Add "-z notext" flag to disable diagnostic 2021-08-15 13:49:39 +10:00
Makefile.postlink